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Derivative of $φ$ with respect to the dimensionless density $δ$

Values for calculation

$ n $
$ δ $
$ I $
$ τ $
$ J $
$ \text{Region} $

Calculation

Derivative of $ φ $ with respect to the dimensionless density $ δ $

$\text{if }\ \text{Region}= 3$
$$φ_δ=n[1]\cdot δ^{-1}+\sum_{i=2}^{40}{n[i]\cdot I[i]\cdot δ^{I[i]-1}\cdot τ^{J[i]}}$$
$\text{else}$
$$φ_δ=0$$